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Электронный компонент: AD1403A

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FUNCTIONAL BLOCK DIAGRAM
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
Low Cost, Precision
2.5 V IC References
AD1403/AD1403A*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
PRODUCT DESCRIPTION
The AD1403 and AD1403A are improved three-terminal, low
cost, temperature compensated, bandgap voltage references that
provide a fixed 2.5 V output voltage for inputs between 4.5 V
and 40 V. A unique combination of advanced circuit design and
laser-wafer-trimmed thin-film resistors provides the AD1403/
AD1403A with an initial tolerance of
10 mV and a tempera-
ture stability of better than 25 ppm/
C. In addition, the low
quiescent current drain of 1.5 mA (max) offers a clear advan-
tage over classical Zener techniques.
The AD1403 or AD1403A is recommended as a stable refer-
ence for all 8-, 10- and 12-bit D-to-A converters that require an
external reference. In addition, the wide input range of the
AD1403/AD1403A allows operation with 5 volt logic supplies,
making these devices ideal for digital panel meter applications
and when only a single logic supply is available.
The AD1403 and AD1403A are specified for operation over the
0
C to +70
C temperature range. The AD580 series of 2.5 volt
precision IC references is recommended for applications where
operation over the 55
C to +125
C range is required.
*Protected by U.S. Patent Numbers: 3,887,863, RE30,586.
FEATURES
Improved, Lower Cost, Replacements for Standard
1403, 1403A
3-Terminal Device: Voltage In/Voltage Out
Laser Trimmed to High Accuracy: 2.500 V
10 mV
(AD1403A)
Excellent Temperature Stability: 25 ppm/ C (AD1403A)
Low Quiescent Current: 1.5 mA max
10 mA Current Output Capability
Low Cost
Convenient Mini-DIP Package
PRODUCT HIGHLIGHTS
1. The AD1403A offers improved initial tolerance over the in-
dustry-standard 1403A:
10 mV versus
25 mV at a lower
cost.
2. The three-terminal voltage in/voltage out operation of the
AD1403/AD1403A provides a regulated output voltage with-
out any external components.
3. The AD1403/AD1403A provides a stable 2.5 V output volt-
age for input voltages between 4.5 V and 40 V making these
devices ideal for systems that contain a single logic supply.
4. Thin film resistor technology and tightly controlled bipolar
processing provide the AD1403A with temperature stabilities
of 25 ppm/
C.
5. The low 1.5 mA maximum quiescent current drain of the
AD1403 and AD1403A makes them ideal for CMOS and
other low power applications.
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2
AD1403/AD1403ASPECIFICATIONS
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage
(I
O
= 0 mA)
V
O
AD1403
2.475
2.500
2.525
V
AD1403A
2.490
2.500
2.510
Temperature Coefficient of Output Voltage
V
O
/
T
ppm/
C
AD1403
10
40
AD1403A
10
25
Output Voltage Change, 0
C to +70
C
V
O
mV
AD1403
7.0
AD1403A
4.4
Line Regulation
Reg
in
mV
(15 V
V
IN
40 V)
1.2
4.5
(4.5
V
IN
15 V)
0.6
3.0
Load Regulation
Reg
load
10
mV
(0 mA < I
O
< 10 mA)
Quiescent Current
I
I
1.2
1.5
mA
(I
O
= 0 mA)
Specifications subject to change without notice.
(V
IN
= 15 V, T
A
= +25 C unless otherwise noted.)
MAXIMUM RATINGS
(T
A
= +25
C unless otherwise noted)
Rating
Symbol
Value
Unit
Input Voltage
V
IN
40
V
Storage Temperature
T
STG
25 to 100
C
Junction Temperature
T
J
+175
C
Operating Ambient
Temperature Range
T
A
0 to +70
C
ORDERING GUIDE
Initial
Package
Model
Tolerance
Option*
AD1403
25 mV
N-8
AD1403A
10 mV
N-8
*N Plastic DIP.
Figure 1. AD1403/AD1403A Connection Diagram
Figure 2. Simplified AD1403 Schematic
AD1403/AD1403A
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3
Figure 3. Typical Change in V
OUT
vs. V
IN
(Normalized to V
OUT
@ V
lN
= 15 V @ T
C
= 25
C)
Figure 4. Change in Output Voltage vs. Load Current
(Normalized to V
OUT
@ V
IN
= 15 V, l
OUT
= 0 mA)
Figure 5. Quiescent Current vs. Temperature
(V
IN
= 15 V, I
OUT
= 0 mA)
Typical Performance Curves
Figure 6. Change in V
OUT
vs. Temperature
(Normalized to V
OUT
@ V
IN
= 15 V)
Figure 7. Change in V
OUT
vs. Temperature
(Normalized to V
OUT
@ V
lN
= 15 V, I
OUT
= 0 mA)
VOLTAGE VARIATION VS. TEMPERATURE AND LINE
Some confusion exists in the area of defining and specifying ref-
erence voltage error over temperature. Historically, references
are characterized using a maximum deviation per degree Centi-
grade; i.e., 10 ppm/
C. However, because of the inconsistent
nonlinearities in Zener references (butterfly or "S" type charac-
teristics), most manufacturers use a maximum limit error band
approach to characterize their references. This technique mea-
sures the output voltage at 3 to 5 different temperatures and
guarantees that the output voltage deviation will fall within the
guaranteed error band at these discrete temperatures. This ap-
proach, of course, makes no mention or guarantee of perfor-
mance at any other temperature within the operating
temperature range of the device.
The consistent Voltage vs. Temperature performance of a typi-
cal AD1403 is shown in Figure 6. Note that the characteristic is
quasi-parabolic, not the possible "S" type characteristics of clas-
sical Zener references. This parabolic characteristic permits a
maximum output deviation specification over the device's full
operating temperature range, rather than just at 3 to 5 discrete
temperatures.
AD1403/AD1403A
REV. A
4
C551a97/82
PRINTED IN U.S.A.
The AD1403 exhibits a worst-case shift of 7.5 mV over the en-
tire range of operating input voltage, 4.5 volts to 40 volts. Typi-
cally, the shift is less than 1 mV as shown in Figure 3.
THE AD1403A AS A LOW POWER, LOW VOLTAGE
PRECISION REFERENCE FOR DATA CONVERTERS
The AD1403A has a number of features that make it ideally
suited for use with A/D and D/A data converters used in com-
plex microprocessor-based systems. The calibrated 2.500 volt
output minimizes user trim requirements and allows operation
from a single low voltage supply. Low power consumption
(1.5 mA quiescent current) is commensurate with that of CMOS-
type devices, while the low cost and small package complements
the decreasing cost and size of the latest converters.
Figure 8 shows the AD1403A used as a reference for the
AD7524 low-cost 8-bit CMOS DAC with complete micro-
Figure 8. Low Power, Low Voltage Reference for the
AD7524 Microprocessor-Compatible 8-Bit DAC
processor interface. The AD1403A and the AD7524 are speci-
fied to operate from a single 5 volt supply; this eliminates the
need to provide a +15 volt power supply for the sole purpose of
operating a reference. The AD7524 includes an 8-bit data regis-
ter, and address decoding logic; it may thus be interfaced di-
rectly to an 8- or 16-bit data bus. Only 300
A of quiescent
current from the single +5 volt supply is required to operate the
AD7524 which is packaged in a small 16-pin DIP. The AD542
output amplifier is also low power, requiring only 1.5 mA quies-
cent current. Its laser-trimmed offset voltage preserves the
1/2
LSB linearity of the AD7524KN without user trims and it typi-
cally settles to
1/2 LSB in less than 5 microseconds. It will pro-
vide the 0 volt to 2.5 volt output swing from
5 volt supplies.
THE AD1403 AS A PRECISION PROGRAMMABLE
CURRENT SOURCE
The AD1403 is an excellent building block for precision current
sources. Its wide range of operating voltages, 4.5 V to 40 V,
along with excellent line regulation over that range (7.5 mV)
result in high insensitivity to varying load impedances. The low
quiescent current (I
I
) of 1.5 mA (max) and the maximum speci-
fied maximum load current of 10 mA allows the user to pro-
gram current to any value between 1.5 mA and 10 mA.
Figure 9a shows the AD1403 connected as a current source.
Total current is equal to the quiescent current plus the load
current. Most of the temperature coefficient comes from the
quiescent current term I
I
, which has a typical TC of 0.13%/
C
(1300 ppm/
C). The load voltage (and hence current) TC is
much lower at
40 ppm/
C max (AD1403). Therefore, the
overall temperature coefficient decreases rapidly as the load cur-
rent is increased. Figure 9b shows the typical temperature coef-
ficient for currents between 1.5 mA and 10 mA. Use of an
AD1403A will not improve the TC appreciably.
Figure 9a. The AD1403 as a Precision Programmable
Current Source
Figure 9b. Typical Temperature Coefficient of Current
Source
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Applying the AD1403/AD1403A
8-Pin Mini-DIP (N)